sudden swelling around the mouth . Has happened before ,
Possible allergic reaction to an insect bite.
Hello dear, welcome to Ask a doctor service.
I read your query and here is my advice.
Probably this is an allergic reaction to a substance, food or drug you had. Since you have a welt on shoulder I suppose it may be a an insect bite.
I think you should take antibiotics antihistamine such citerizine and also an.
ibuprofen for swelling.
If the swelling doesn't get better you should go to ER for epinephrine and prednisone injections n
Hope I have answered the question.
Let me know if I can assist you further.